Traficom issues new SMS sender ID regulation in Finland

The Finnish Transport and Communications Agency Traficom has issued an official regulation governing the authorisation of SMS sender information in Finland. The regulation was published on 16 December 2025 and will enter into force on 4 May 2026.

LINK Mobility will guide its customers through the entire process.

Please wait for our instructions and do not take any action yet.
For any questions, please contact LINK Mobility Support.

Background and purpose of the regulation

Traficom’s new regulation (28 L/2025 M) requires telecommunications operators to verify the legitimacy of SMS sender information. The objective is to reduce fraud and phishing by preventing the use of spoofed sender IDs.

As a result, organization sending SMS messages to Finland must formally authorize:

Finnish phone numbers used as sender

Alphanumeric sender IDs (Sender IDs)

Without authorization, message delivery will be restricted or modified.

Implementation timeline

From 4 May 2026
Messages sent with unauthorised sender IDs will be blocked or the sender ID will be replaced with “Tuntematon/Unknown”.

From 2 November 2026
Messages sent with unauthorised sender IDs will be labelled “Roskaposti/Spam”.

Impact for SMS Senders to Finland

Area	Description
Scope	Applies to all organisations sending SMS messages to Finnish recipients, regardless of sender location
Sender types	Finnish long numbers and alphanumeric Sender IDs
Mandatory requirement	Sender IDs must be authorised via your service provider (LINK Mobility)
Optional measure	Sender IDs can be protected through registration with Traficom
Consequences of non-compliance	Messages may be blocked, displayed as “Unknown”, or later marked as “Spam”
Delivery assurance	Authorisation ensures continued delivery and sender credibility
Process ownership	LINK Mobility manages or supports the process end-to-end

Authorization and protection explained

Authorization (mandatory)

All Finnish phone numbers and alphanumeric sender IDs must be authorized with local mobile network operators.
This requirement applies to all SMS traffic to Finland.

Authorization is completed with and through LINK Mobility, who coordinates with operators on your behalf.

For assistance, customers should contact LINK Mobility Support .

Protection (optional)

Sender ID protection provides an additional layer of security:

The sender ID is registered with Traficom

LINK Mobility implements the protection with operators

Protection grants exclusive rights to the alphanumeric sender ID, preventing misuse

LINK Mobility’s role

LINK Mobility has been actively involved in industry-wide collaboration with Traficom, mobile network operators, and other stakeholders to define the new framework.

Depending on customer needs, we will:

Handle authorization and/or protection on your behalf, or

Provide clear guidance and required documentation through LINK Mobility Support

Our priority is to ensure uninterrupted SMS delivery for our customers.

LINK Mobility has actively participated in discussions with Traficom, the National Bureau of Investigation, Digital Forum, operators, and industry stakeholders to develop the new guidelines. We believe these changes will significantly improve the security and reliability of messaging.

Ilkka Vertanen

Sales & Marketing Director, LINK Mobility Finland

How LINK Mobility will support you

At this stage, no action is required from customers.

LINK Mobility will take a proactive role in ensuring compliance with Traficom’s regulation and uninterrupted SMS delivery to Finland. All communication and support will be handled via LINK Mobility Support.